package com.bjsxt;

import java.awt.*;
import java.awt.event.KeyEvent;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

public class Tank {
    public static final int XSPEED = 8;
    public static final int YSPEED = 8;

    private boolean live = true;
    private BloodBar bb = new BloodBar();

    private int life = 100;

    TankClient tc;

    private boolean good;

    private int x, y;
    private int oldX, oldY;

    private static Random r = new Random();

    private boolean bL = false, bU = false, bR = false, bD = false;

    private Direction dir = Direction.STOP;
    private Direction ptDir = Direction.D;

    private int step = r.nextInt(12) + 3;

    private static Toolkit tk = Toolkit.getDefaultToolkit();
    private static Image[] tankImages = null;
    private static Map<String, Image> imgs = new HashMap<String, Image>();

    // 使用静态初始化块
    static {
        // 静态初始化图片数组
        tankImages = new Image[]{
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankL.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankLU.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankU.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankRU.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankR.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankRD.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankD.gif")),
                tk.getImage(Tank.class.getClassLoader().getResource("images/tankLD.gif"))
        };
        // 使用键值存储
        imgs.put("L", tankImages[0]);
        imgs.put("LU", tankImages[1]);
        imgs.put("U", tankImages[2]);
        imgs.put("RU", tankImages[3]);
        imgs.put("R", tankImages[4]);
        imgs.put("RD", tankImages[5]);
        imgs.put("D", tankImages[6]);
        imgs.put("LD", tankImages[7]);

    }

    public static final int WIDTH = 30;
    public static final int HEIGHT = 30;

    public Tank(int x, int y, boolean good) {
        this.x = x;
        this.y = y;
        this.oldX = x;
        this.oldY = y;
        this.good = good;
    }

    public Tank(int x, int y, boolean good, Direction dir, TankClient tc) {
        this(x, y, good);
        this.dir = dir;
        this.tc = tc;
    }

    public void draw(Graphics g) {
        if (!live) {
            if (!good) {
                tc.tanks.remove(this);
            }
            return;
        }

        if (good) bb.draw(g);

        switch (ptDir) {
            case L:
                g.drawImage(imgs.get("L"), x, y, null);
                break;
            case LU:
                g.drawImage(imgs.get("LU"), x, y, null);
                break;
            case U:
                g.drawImage(imgs.get("U"), x, y, null);
                break;
            case RU:
                g.drawImage(imgs.get("RU"), x, y, null);
                break;
            case R:
                g.drawImage(imgs.get("R"), x, y, null);
                break;
            case RD:
                g.drawImage(imgs.get("RD"), x, y, null);
                break;
            case D:
                g.drawImage(imgs.get("D"), x, y, null);
                break;
            case LD:
                g.drawImage(imgs.get("LD"), x, y, null);
                break;
        }

        move();
    }

    void move() {

        this.oldX = x;
        this.oldY = y;

        switch (dir) {
            case L:
                x -= XSPEED;
                break;
            case LU:
                x -= XSPEED;
                y -= YSPEED;
                break;
            case U:
                y -= YSPEED;
                break;
            case RU:
                x += XSPEED;
                y -= YSPEED;
                break;
            case R:
                x += XSPEED;
                break;
            case RD:
                x += XSPEED;
                y += YSPEED;
                break;
            case D:
                y += YSPEED;
                break;
            case LD:
                x -= XSPEED;
                y += YSPEED;
                break;
            case STOP:
                break;
        }

        if (this.dir != Direction.STOP) {
            this.ptDir = this.dir;
        }

        if (x < 0) x = 0;
        if (y < 30) y = 30;
        if (x + Tank.WIDTH > TankClient.GAME_WIDTH) x = TankClient.GAME_WIDTH - Tank.WIDTH;
        if (y + Tank.HEIGHT > TankClient.GAME_HEIGHT) y = TankClient.GAME_HEIGHT - Tank.HEIGHT;

        if (!good) {
            Direction[] dirs = Direction.values();
            if (step == 0) {
                step = r.nextInt(12) + 3;
                int rn = r.nextInt(dirs.length);
                dir = dirs[rn];
            }
            step--;

            if (r.nextInt(40) > 36) this.fire();
        }
    }

    private void stay() {
        x = oldX;
        y = oldY;
    }

    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        switch (key) {
            case KeyEvent.VK_F2:
                if (!this.live) {
                    this.live = true;
                    this.life = 100;
                }
                break;
            case KeyEvent.VK_LEFT:
                bL = true;
                break;
            case KeyEvent.VK_UP:
                bU = true;
                break;
            case KeyEvent.VK_RIGHT:
                bR = true;
                break;
            case KeyEvent.VK_DOWN:
                bD = true;
                break;
        }
        locateDirection();
    }

    void locateDirection() {
        if (bL && !bU && !bR && !bD) dir = Direction.L;
        else if (bL && bU && !bR && !bD) dir = Direction.LU;
        else if (!bL && bU && !bR && !bD) dir = Direction.U;
        else if (!bL && bU && bR && !bD) dir = Direction.RU;
        else if (!bL && !bU && bR && !bD) dir = Direction.R;
        else if (!bL && !bU && bR && bD) dir = Direction.RD;
        else if (!bL && !bU && !bR && bD) dir = Direction.D;
        else if (bL && !bU && !bR && bD) dir = Direction.LD;
        else if (!bL && !bU && !bR && !bD) dir = Direction.STOP;
    }

    public void keyReleased(KeyEvent e) {
        int key = e.getKeyCode();
        switch (key) {
            case KeyEvent.VK_ENTER:
                fire();
                break;
            case KeyEvent.VK_LEFT:
                bL = false;
                break;
            case KeyEvent.VK_UP:
                bU = false;
                break;
            case KeyEvent.VK_RIGHT:
                bR = false;
                break;
            case KeyEvent.VK_DOWN:
                bD = false;
                break;
            case KeyEvent.VK_ADD:
                superFire();
                break;
        }
        locateDirection();
    }

    public Missile fire() {
        if (!live) return null;
        int x = this.x + Tank.WIDTH / 2 - Missile.WIDTH / 2;
        int y = this.y + Tank.HEIGHT / 2 - Missile.HEIGHT / 2;
        Missile m = new Missile(x, y, good, ptDir, this.tc);
        tc.missiles.add(m);
        return m;
    }

    public Missile fire(Direction dir) {
        if (!live) return null;
        int x = this.x + Tank.WIDTH / 2 - Missile.WIDTH / 2;
        int y = this.y + Tank.HEIGHT / 2 - Missile.HEIGHT / 2;
        Missile m = new Missile(x, y, good, dir, this.tc);
        tc.missiles.add(m);
        return m;
    }

    public Rectangle getRect() {
        return new Rectangle(x, y, WIDTH, HEIGHT);
    }

    public boolean isLive() {
        return live;
    }

    public void setLive(boolean live) {
        this.live = live;
    }

    public boolean isGood() {
        return good;
    }

    public boolean collidesWithWall(Wall w) {
        if (this.live && this.getRect().intersects(w.getRect())) {
            this.stay();
            return true;
        }
        return false;
    }

    public boolean collidesWithTanks(java.util.List<Tank> tanks) {
        for (int i = 0; i < tanks.size(); i++) {
            Tank t = tanks.get(i);
            if (this != t) {
                if (this.live && t.isLive() && this.getRect().intersects(t.getRect())) {
                    this.stay();
                    t.stay();
                    return true;
                }
            }
        }
        return false;
    }

    private void superFire() {
        Direction[] dirs = Direction.values();
        for (int i = 0; i < 8; i++) {
            fire(dirs[i]);
        }
    }

    public int getLife() {
        return life;
    }

    public void setLife(int life) {
        this.life = life;
    }

    private class BloodBar {
        public void draw(Graphics g) {
            Color c = g.getColor();
            g.setColor(Color.RED);
            g.drawRect(x + 9, y - 5, WIDTH, 10);
            int w = WIDTH * life / 100;
            g.fillRect(x + 9, y - 5, w, 10);
            g.setColor(c);
        }
    }

    public boolean eat(Blood b) {
        if (this.live && b.isLive() && this.getRect().intersects(b.getRect())) {
            this.life = 100;
            b.setLive(false);
            return true;
        }
        return false;
    }
}